I'm getting p0089 code every few weeks. Hpfp going out or what u guys think?

 

Knowing that you have hpt, I would start with monitoring and graphing your desired rail pressure vs actual rail pressure, particularly during wot pulls. For this sort of stuff I'll personally usually graph stft, ltft, lambda, maf hz, desired rail pressure, actual rail pressure, ipw and idc all together to see how everything is working together. This will at least put you in the right zip code to start identifying your issue.

More than likely it will be pump related, but identifying the issue rather than assuming something is obviously your best bet.... and least expensive. lol

 

It's kinda hard seeing as it only happens every few weeks. Iv done a few logs and didn't see nothing. Tuner looked and didn't see anything either, but then again I wasn't logging when it popped up. I was like an hour before. So if basically have to log and do pulls till I let pops lol

 

At least you can have fun trying^

 

Ha yea with my luck get pulled over

 

No interceptor? You can set the annunciator to flash the leds at certain set points. If you set it a bit below your fuel rail pressure target and at certain rpms, it would alert you of a drop. Instead of logging every...day.,.... lol

 

yes I do i forgot about that. i shall do that.

 

I wonder if shifting the injection window would help, I remember mine doing this and someone had suggested to adjust the HOM single low table, it did not drop again after that. Yours may be the physical pump going bad, not sure though. I'm back on 93 and alky/water injection now though. And what fuel pressure are you commanding at WOT?

 

I don't know I have to look at my tune. My car is getting body work done so I can't check that way either. Term2 did my tune so I'm gonna say enough lol. I haven't had an issue for over almost a year of having this tune it just started happening a month or so ago

 

Make sure to check the wiring that goes to the fuel pump as shown in this thread.
p0087 & p0089 codes/ power reduced - Cobalt SS Network

Also, I had a similar issue awhile back and it was the giant wire loom the run to the right of the intake manifold. It was rubbing against the high pressure fuel pump. It was rubbing and causing engine power reduced.

 

I don't get power reduced, just code pops up then clear it and it doesn't for a while.

 

Injection window is advanced. Car is on 91 plus meth unless he switched back to just 91. Rail pressure has always looked fine on all the logs he has given me. That code implies that the fuel pressure regulator is starting to go out or the wiring going to it is not making a good connection.

 

If anything, the meth would counter any injection window issues, especially when working with something a little easier on the fuel system like 91.

Tom, I assume you're not having any issues with the meth kit hopefully? Clogged nozzle maybe? This could force the ecm to suddenly dump a ton of fuel in order to compensate for the lack of meth being sprayed and accounted for in the tune, which would of course substantially effect your fueling system. Seeing kr during a pull could possible indicate a meth issue here.

Just spit balling....

 

I accidentally posted here and don't see a delete button, sorry :S